Any pros want to give me some advice on the best way to spend $1500 - $2000 on a mower? I have about a 1/2 acre of new bermuda sod on a slope with a few elevation changes and a couple of small berms. I want to cut the lawn in no more than an hour and I want it to look great (of course). My installer recommended against a rider with a belly deck. He suggested a Gravely walk behind. I am willing to spend the money up front if the mower will last a long time. Thanks!